Isuzu 4JG2 User Manual

00 – 36 SERVICE INF
ORMATION
mm (
in)
Serv
ice standard Service limit
Parts
Items
4JG2
4JB1 / 4JB1T /
4JB1TC
4JG2
4JB1 / 4JB1T /
4JB1TC
Remarks
Piston diameter
95.365 - 95.404
(3.7545-3.9039)
92.985 - 93.024
(3.6600-3.6623)
-
Piston,
Pis
ton
pin,
Piston
ring and
Connect-
ing rod
Piston Clearance
(Between piston and
Cylinder liner)
Piston ring gap 1st
2nd
Oil
Piston ring clearance 1st
2nd
0.047 - 0.065
(0.0019-0.0026)
0.20 - 0.35
(0.0079 –
0.0138)
0.37 - 0.52
(0.0146 -
0.0205)
0.20 - 0.40
(0.0079 -
0.00157)
0.09 - 0.13
(0.0035 -
0.0051)
0.05 - 0.09
(0.002 -
0.0035)
0.025 - 0.045
(0.0010-0.0018)
0.20 - 0.40
(0.0079 –
0.0157)
0.20 - 0.40
(0.0079 -
0.00157)
0.10 - 0.30
(0.0039 -
0.0118)
0.090 - 0.125
(0.0035 -
0.0049)
0.050 - 0.075
(0.0020 -
0.0030)
-
1.5 (0.0591)
1.5 (0.0591)
1.5 (0.0591)
0.15 (0.0059)
Oil 0.03 - 0.07
(0.0012 - 0.0028)
0.15 (0.0059)
Piston pin diameter
33.995 - 34.000
(1.3384-1.3386)
30.995 - 31.000
(1.2202-1.2204)
33.970
(1.3374)
30.970
(1.2190)
Fitting interference
(Betw
een connecting
rod and piston pin)
Fitting interference
(Between piston and
piston pin)
Connecting rod
alignment Bend
Twist
Piston pin and Connecting
Rod Bushing Clearance
Connecting rod thrust
clearance
0.008 - 0.020
(0.0003 - 0.0008)
0.002 - 0.015
(0.0001 - 0.0006)
0.08 (0.0031) or less
0.05 (0.0020) or less
0.008 - 0.020
(0.0003 - 0.0008)
0.230 (0.0091)
0.05 (0.0020)
0.04 (0.0016)
0.20 (0.0079)
0.15 (0.0059)
0.050 (0.0020)
0.35 (0.0138)
0.029 -0.083
0.029 - 0.066 0.100 (0.0039)
(0.0014 -
(0.0011 -
O
il clearance
(Between crank pin and
Connecting rod) 0.0033) 0.0026)
Per 100
(3.94)
Per 100
(3.94)

Isuzu 4JG2 Specifications

General

Fuel System	Indirect injection
Cooling System	Water-cooled
Fuel Type	Diesel
Displacement	3.059 L (3059 cc)
Bore x Stroke	95.4 mm x 107 mm
Torque Output	2000 rpm
Valvetrain	Overhead valve (OHV)